diff --git a/CHANGELOG.md b/CHANGELOG.md
index 198fc9b8a..11b7b6735 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [1.12.20](https://github.com/googleapis/java-pubsublite/compare/v1.12.19...v1.12.20) (2024-01-11)
+
+
+### Bug Fixes
+
+* **deps:** Update the Java code generator (gapic-generator-java) to 2.31.0 ([#1566](https://github.com/googleapis/java-pubsublite/issues/1566)) ([565e18f](https://github.com/googleapis/java-pubsublite/commit/565e18f66542c970d9abcab2132da079f128ceeb))
+
+
+### Dependencies
+
+* Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.21.0 ([#1565](https://github.com/googleapis/java-pubsublite/issues/1565)) ([d3a6a0b](https://github.com/googleapis/java-pubsublite/commit/d3a6a0b7cad46d868a86d14f41c0e5b6ba36403d))
+
 ## [1.12.19](https://github.com/googleapis/java-pubsublite/compare/v1.12.18...v1.12.19) (2023-12-01)
 
 
diff --git a/google-cloud-pubsublite-bom/pom.xml b/google-cloud-pubsublite-bom/pom.xml
index 531e679ae..38a4e377d 100644
--- a/google-cloud-pubsublite-bom/pom.xml
+++ b/google-cloud-pubsublite-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-pubsublite-bom</artifactId>
-  <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+  <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
   <packaging>pom</packaging>
   <parent>
     <groupId>com.google.cloud</groupId>
@@ -52,17 +52,17 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+        <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-pubsublite-v1</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-pubsublite-v1:current} -->
+        <version>1.12.20</version><!-- {x-version-update:grpc-google-cloud-pubsublite-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-pubsublite-v1</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-pubsublite-v1:current} -->
+        <version>1.12.20</version><!-- {x-version-update:proto-google-cloud-pubsublite-v1:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/google-cloud-pubsublite/pom.xml b/google-cloud-pubsublite/pom.xml
index d454c72da..877ebae15 100644
--- a/google-cloud-pubsublite/pom.xml
+++ b/google-cloud-pubsublite/pom.xml
@@ -3,13 +3,13 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-pubsublite-parent</artifactId>
-    <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+    <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-pubsublite</artifactId>
-  <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+  <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Pub/Sub Lite</name>
   <url>https://github.com/googleapis/java-pubsublite</url>
@@ -47,12 +47,12 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-pubsublite-v1</artifactId>
-      <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+      <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-cloud-pubsublite-v1</artifactId>
-      <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+      <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     </dependency>
     <dependency>
       <groupId>com.google.flogger</groupId>
diff --git a/grpc-google-cloud-pubsublite-v1/pom.xml b/grpc-google-cloud-pubsublite-v1/pom.xml
index f97a2a7d9..6a8e2c3c4 100644
--- a/grpc-google-cloud-pubsublite-v1/pom.xml
+++ b/grpc-google-cloud-pubsublite-v1/pom.xml
@@ -4,20 +4,20 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-pubsublite-v1</artifactId>
-  <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+  <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
   <name>grpc-google-cloud-pubsublite-v1</name>
   <description>GRPC library for grpc-google-cloud-pubsublite-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-pubsublite-parent</artifactId>
-    <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+    <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <dependencies>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-pubsublite-v1</artifactId>
-      <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+      <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/pom.xml b/pom.xml
index 4dede1cd4..a7272d974 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-pubsublite-parent</artifactId>
-  <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+  <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
   <packaging>pom</packaging>
   <name>Google Cloud Pub/Sub Lite Parent</name>
   <url>https://github.com/googleapis/java-pubsublite</url>
@@ -25,17 +25,17 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-pubsublite-v1</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-pubsublite-v1:current} -->
+        <version>1.12.20</version><!-- {x-version-update:proto-google-cloud-pubsublite-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-pubsublite-v1</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-pubsublite-v1:current} -->
+        <version>1.12.20</version><!-- {x-version-update:grpc-google-cloud-pubsublite-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite</artifactId>
-        <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+        <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
diff --git a/proto-google-cloud-pubsublite-v1/pom.xml b/proto-google-cloud-pubsublite-v1/pom.xml
index 0754c9d8e..fea25b8eb 100644
--- a/proto-google-cloud-pubsublite-v1/pom.xml
+++ b/proto-google-cloud-pubsublite-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-pubsublite-v1</artifactId>
-  <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+  <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
   <name>proto-google-cloud-pubsublite-v1</name>
   <description>PROTO library for proto-google-cloud-pubsublite-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-pubsublite-parent</artifactId>
-    <version>1.12.20-SNAPSHOT</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
+    <version>1.12.20</version><!-- {x-version-update:google-cloud-pubsublite:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <dependencies>
diff --git a/samples/snapshot/pom.xml b/samples/snapshot/pom.xml
index b55e0ec98..d86aabd5c 100644
--- a/samples/snapshot/pom.xml
+++ b/samples/snapshot/pom.xml
@@ -45,7 +45,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsublite</artifactId>
-      <version>1.12.20-SNAPSHOT</version>
+      <version>1.12.20</version>
     </dependency>
     <!-- {x-version-update-end} -->
     <dependency>
diff --git a/versions.txt b/versions.txt
index 46c473999..236b58e98 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,7 +1,7 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-pubsublite:1.12.19:1.12.20-SNAPSHOT
-pubsublite-beam-io:0.31.19:0.31.20-SNAPSHOT
-proto-google-cloud-pubsublite-v1:1.12.19:1.12.20-SNAPSHOT
-grpc-google-cloud-pubsublite-v1:1.12.19:1.12.20-SNAPSHOT
+google-cloud-pubsublite:1.12.20:1.12.20
+pubsublite-beam-io:0.31.20:0.31.20
+proto-google-cloud-pubsublite-v1:1.12.20:1.12.20
+grpc-google-cloud-pubsublite-v1:1.12.20:1.12.20